Hi all,
Here is another round of the mempressure cgroup. This time I dared to remove the RFC tag. :)
In this revision:
- Addressed most of Kirill Shutemov's comments. I didn't bother implementing per-level lists, though. It would needlessly complicate the logic, and the gain would be only visible with lots of watchers (which we don't have for our use-cases). But it is always an option to add the feature;
- I've split the pach into two: 'shrinker' and 'levels' parts. While the full-fledged userland shrinker is an interesting idea, we don't have any users ready for it, so I won't advocate for it too much.
And since at least Kirill has some concerns about it, I don't want the shrinker to block the pressure levels.
So, these are now separate. At some point, I'd like to both of them merged, but if anything, let's discuss them separately;
- Rebased onto v3.8-rc2.
RFC v2 (http://lkml.org/lkml/2012/12/10/128):
- Added documentation, describes APIs and the purpose; - Implemented shrinker interface, this is based on Andrew's idea and supersedes my "balance" level idea; - The shrinker interface comes with a stress-test utility, that is what Andrew was also asking for. A simple app that we can run and see if the thing works as expected; - Added reclaimer's target_mem_cgroup handling; - As promised, added support for multiple listeners, and fixed some other comments on the previous RFC.
RFC v1 (http://lkml.org/lkml/2012/11/28/109)
-- Documentation/cgroups/mempressure.txt | 97 +++++ Documentation/cgroups/mempressure_test.c | 213 ++++++++++ include/linux/cgroup_subsys.h | 6 + include/linux/vmstat.h | 11 + init/Kconfig | 13 + mm/Makefile | 1 + mm/mempressure.c | 487 +++++++++++++++++++++++ mm/vmscan.c | 4 + 8 files changed, 832 insertions(+)